| Business | Phone |
| Wel-Co 1500 S Whittle Ave, Olney 62450 | (618) 392-7027 |
| Yockey Oil Inc 1043 W Main St, Olney 62450 | (618) 393-6236 |
| Tri-State Producing/Devmnt Inc 1060 W Main St, Olney 62450 | (618) 393-2176 |
| Monarch Production Co 930 W Lafayette St, Olney 62450 | (618) 392-2067 |
| Murvin Oil Co 1712 S Whittle Ave, Olney 62450 | (618) 393-2124 |